Path split unit and safety valve for suspension device

Abstract

A safety valve includes a first part and a second part. The first part has a main chamber, and a sub chamber is defined between the first and second parts. A path split unit includes a base with a recess which communicates with the sub chamber. The base has a main path communicating with the main chamber, and a sub-path unit communicating with a sub chamber. One end of the sub-path unit communicates with the main path. A safety path unit communicates between the sub chamber and the recess and the sub-path unit by a communication path. A switch unit is received in the recess and controls the communication between the main path and the sub-path unit. When a severe and sudden impact is transferred to the suspension device, a portion of liquid in the main path flows into the sub chamber to provide a level of buffering feature.

What is claimed is: 
     
         1 . A path split unit of a suspension device, comprising:
 a base;   a recess defined in a top of the base for receiving a switch unit therein;   a main path defined in the base and communicating with a main chamber;   a sub-path unit located in the base and having a first sub path and a second sub-path, the first sub-path being in communication between the main path and a sub chamber, the second sub-path being in communication between the recess and the sub chamber;   a safety path unit located in the base and having a safety path which communicates with the sub chamber, and   a communication path located in the base and communicating with the first sub-path, the recess and the safety path.   
     
     
         2 . A safety valve of a suspension device which has an inner tube and an outer tube which is movably mounted to the inner tube, the safety valve comprising:
 a tube unit adapted to be located in the inner tube and having a first part and a second part which is mounted to the first part, the first part having a main chamber defined therein, a sub chamber defined between the first and second parts;   a path split unit having a base which has a recess defined in a top thereof, the recess communicating with the sub chamber, the base having a main path and a sub-path unit, the main path communicating with the main chamber, the sub-path unit communicating with the sub chamber, one end of the sub-path unit communicating with the main path;   a safety path unit having one end communicating the sub chamber, the other end of the safety path unit communicating with the recess and the sub-path unit by a communication path, and   a switch unit received in the recess, when the switch unit is turned off, the suspension device is locked, a communication between the main path and the sub-path unit is closed, when an impact that is higher than a pre-set value of the suspension device is transferred to the suspension device, a portion of liquid in the main path flows into the sub chamber via the communication path and the safety path unit to provide a level of buffering feature.   
     
     
         3 . The path split unit as claimed in  claim 1 , wherein the safety path unit has a first safety path and a second safety path, the first safety path is in communication between the communication path and the main chamber, and the second safety path is in communication between the communication path and the sub chamber. 
     
     
         4 . The safety valve as claimed in  claim 2 , wherein the sub-path unit has a first sub-path and a second sub-path, the first sub-path is in communication between the main path and the sub chamber, the second sub-path is in communication between the recess and the sub chamber, the communication path communicates with the first sub-path, the recess and the safety path unit. 
     
     
         5 . The path split unit as claimed in  claim 2 , wherein the safety path unit has a safety valve received therein so as to adjust pressure of liquid in the safety path unit to break through a pre-set value, the path split unit has a connection part which is located above the base so as to receive the switch unit and the safety valve therein. 
     
     
         6 . The safety valve as claimed in  claim 5 , wherein a cover is connected to a top of the connection part, a portion of the switch unit and a portion of the safety valve extending through the cover. 
     
     
         7 . The safety valve as claimed in  claim 1 , wherein the safety path unit has a safety valve received therein so as to adjust pressure of liquid in the safety path unit to break through a pre-set value, the safety valve has an adjustment rod which has one end connected to the base, the other end of the adjustment rod extends beyond the base, a bead located in the safety path unit to block the liquid in the safety path unit, a resilient member is located between the bead and the adjustment rod, a knob is connected to the adjustment rod that exposed beyond the base so as to rotate the adjustment rod, the adjustment rod linearly moves in the base to adjust a distance between the adjustment rod and the bead, and to adjust a compression of the resilient member. 
     
     
         8 . The safety valve as claimed in  claim 2 , wherein the first part is a tubular member, the second part is a pouch made by elastic material. 
     
     
         9 . The safety valve as claimed in  claim 2 , wherein the switch unit has a shaft which has one end located in the recess and the other end of the shaft extends beyond the base, the shaft has a guide path which communicates with the sub chamber to guide liquid in the communication path into the sub chamber, when the shaft is rotated an angle, the guide path is closed so that liquid cannot flow between the main chamber, the sub chamber and the path split unit, the portion of the shaft that is exposed beyond the base is connected with a switch which rotates the shaft to control a communication of the guide path. 
     
     
         10 . The safety valve as claimed in  claim 9 , wherein the sub-path unit has at least one second sub-path which is in communication between the recess and the sub chamber, the guide path has at least one guide hole defined in the shaft, when the shaft is rotated the angle, the at least one guide hole is located corresponding to the at least one second sub-path, the liquid flows through the at least one guide hole and the at least one second sub-path to provide buffering feature, when the shaft is rotated another angle, the at least one guide hole is located offset from the at least one second sub-path, the liquid cannot flow through the at least one guide hole and the at least one second sub-path, the suspension device is locked. 
     
     
         11 . The safety valve as claimed in  claim 2 , wherein the safety path unit has a first safety path and a second safety path, the first safety path is in communication between the communication path and the main chamber, the second safety path is in communication between the communication path  50  and the sub chamber.